Damir Makhmutov

function crud(app, path, controller) {
    app.get(path, controller.get);
    app.post(path, controller.post);
    app.delete(`${path}/:id`, controller.delete);
    app.put(`${path}/:id`, controller.put);    
}

class NotesController {
    get(req, res) {
        db.listNotes().then(data => res.send(data));
    }

    post(req, res) {
        db.createNote(req.body).then(data => res.send(data));
    }

    delete(req, res) {
        db.deleteNote(req.params.id).then(data => res.send(data));
    }

    put(req, res) {
        db.updateNote(req.params.id).then(data => res.send(data));
    }
}

crud(app, '/notes', new NotesController);
crud(app, '/users', new UsersController);